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Ik higher than I''k

Greg Walton

Hi,

I've been putting together an extensive network model for an LV private network on ETAP. For some reason when I perform a fault level study, the value for steady-state current (Ik) is coming out as larger than the value for initial fault current (I''k). Now, my knowledge of fault decay curves would indicate that Ik would always be equal to or less than I''k as the DC component decays. Nevertheless I can't seem to find any issues with the model, and the result comes up a few times...

Can anyone think of a situation where the fault current of Ik might be larger than I''k?

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    without knowing anything about how you have set up the ETAP simulator ,what sort of assumptions are being made - is the source highly inductive, so that at the instant of short almost no current flows, ? What is the most reduced set of conditions that exhibit this, and then can you post some numbers so the result can be checked in a non software way ?

    regards Mike.

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  • 0

    without knowing anything about how you have set up the ETAP simulator ,what sort of assumptions are being made - is the source highly inductive, so that at the instant of short almost no current flows, ? What is the most reduced set of conditions that exhibit this, and then can you post some numbers so the result can be checked in a non software way ?

    regards Mike.

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